single_set_ptr_test.cc

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// Copyright 2022 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#include "src/core/lib/gprpp/single_set_ptr.h"
 
#include <thread>
 
#include <gtest/gtest.h>
 
namespace grpc_core {
namespace testing {
 
TEST(SingleSetPtrTest, NoOp) { SingleSetPtr<int>(); }
 
TEST(SingleSetPtrTest, CanSet) {
  SingleSetPtr<int> p;
  EXPECT_FALSE(p.is_set());
  EXPECT_DEATH_IF_SUPPORTED(gpr_log(GPR_ERROR, "%d", *p), "");
  p.Set(new int(42));
  EXPECT_EQ(*p, 42);
}
 
TEST(SingleSetPtrTest, CanReset) {
  SingleSetPtr<int> p;
  EXPECT_FALSE(p.is_set());
  p.Set(new int(42));
  EXPECT_TRUE(p.is_set());
  p.Set(new int(43));
  EXPECT_EQ(*p, 42);
  p.Reset();
  EXPECT_FALSE(p.is_set());
}
 
TEST(SingleSetPtrTest, LotsOfSetters) {
  SingleSetPtr<int> p;
  std::vector<std::thread> threads;
  threads.reserve(100);
  for (int i = 0; i < 100; i++) {
    threads.emplace_back([&p, i]() { p.Set(new int(i)); });
  }
  for (auto& t : threads) {
    t.join();
  }
}
 
}  // namespace testing
}  // namespace grpc_core
 
int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}